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Chapter 19 Digital Input/Output

18-3

18.3 AL_DigBitsTest

Prototype C\C++

STATUS AL_API AL_DigBitsTest(LHLD lhld, long lChan, long lTestBits);

Visual Basic for Windows

Function AL_DigBitsTest(ByVal lhld As Long, ByVal lChan As Long,

ByVal lTestBits As Long) As Long

LHLD lhld handle of the LDSD

double lChan specifies the input port channel number

long lTestBits specifies the input port bits to test

The AL_DigBitsTest function immediately retrieves input status of a digital input port.

Parameter Description

lhld Identifies the instance of the logical device subsystem.

lChan Specifies the input port channel.

lTestBits Selects the bits that the function will operate on. All bits set in the lTestBits

will be checked for a true (1) condition.

Note:

Digital IO channels 0 & 1 for all supported hardware are only 8 bit ports. Digital Channels 2 & 3, for all

except a Pci5500 (which don’t have ports 2 & 3), are 16 bit ports. The lChan parameter for all Pci55xx

boards should be set to zero. All four digital ports are hardware programmable as either input or output

ports and can be represented by either DINx or DOTx, but not both. Port direction programming is

determined by the first call to either the AL_DigInput/AL_DigBitsTest functions for an input ports or the

AL_DigOuput function for an output port.

Returns:

On success STATUS is set to one (1) if all of the lTestBits are true and set to zero (0) if any lTestBits are

false, otherwise STATUS contains the negative error code that occurred during the call.

Related Functions:

AL_DigInput

AL_DigOutput

Program References:

Adldio01, Adldio23

Supported Logical Device Subsystems:

Pci5500: DIN0, DIN1, DOT0, DOT1

Pci55xx Series: DIN0, DIN1, DIN2, DIN3, DOT0, DOT1, DOT2, DOT3

1 2 ... 62 63 64 65 66 67 68 69 70 71 72 ... 190 191

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Measurement-computing ADLIB WIN Manuale Utente Pagina 67